1 files changed, 26 insertions, 0 deletions
diff --git a/libntp/ymd2yd.c b/libntp/ymd2yd.c
new file mode 100644
index 0000000..c6b3a0c
--- /dev/null
+++ b/libntp/ymd2yd.c
@@ -0,0 +1,26 @@
+/*
+ * ymd2yd - compute the date in the year from y/m/d
+ *
+ * A thin wrapper around a more general calendar function.
+ */
+
+#include <config.h>
+#include "ntp_stdlib.h"
+#include "ntp_calendar.h"
+
+int
+ymd2yd(
+	int y,
+	int m,
+	int d)
+{
+	/*
+	 * convert y/m/d to elapsed calendar units, convert that to
+	 * elapsed days since the start of the given year and convert
+	 * back to unity-based day in year.
+	 *
+	 * This does no further error checking, since the underlying
+	 * function is assumed to work out how to handle the data.
+	 */
+	return ntpcal_edate_to_yeardays(y-1, m-1, d-1) + 1;
+}